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Closed pore CNTs/Al-Si composite foamed material and preparation method thereof

A composite foam and closed-cell technology, which is applied in the field of foam materials, can solve the problems of low efficiency and long process time, and achieve the effects of simple and stable preparation process, low strain rate sensitivity effect, and uniform cell distribution

Active Publication Date: 2018-02-09
CIVIL AVIATION UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process time of this method is long and the efficiency is low; in addition, the material prepared by adding a pore-forming agent has open or semi-open pores, and only when the porosity is low can closed pores be formed.

Method used

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  • Closed pore CNTs/Al-Si composite foamed material and preparation method thereof
  • Closed pore CNTs/Al-Si composite foamed material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] A closed-cell CNTs / Al-Si composite foam material prepared from the following raw materials: 7wt% silicon powder, 1.5wt% TiH 2 powder, and the rest is CNTs / Al powder obtained by in-situ chemical vapor deposition. Among them, the particle size of silicon powder is 40-200 mesh, TiH 2 The particle size of the powder is 325-400 mesh, and the particle size of the CNTs / Al powder obtained by in-situ chemical vapor deposition is 100-250 mesh.

[0033] The preparation method of the closed-cell CNTs / Al-Si composite foam material in this embodiment includes the following steps: (1) The CNTs / Al powder obtained by in-situ chemical vapor deposition is subjected to mechanical ball milling, the ball milling speed is 400rpm, and the time is 90min. Material ratio is 10:1; (2) TiH 2 The foaming agent was pre-oxidized at 450°C for 90 minutes, and then the CNTs / Al powder obtained after ball milling in step (1) was mixed with silicon powder, magnesium powder, and foaming agent in a mixer fo...

Embodiment 2

[0038] A closed-cell CNTs / Al-Si composite foam material prepared from the following raw materials: 5wt% silicon powder, 0.5wt% magnesium powder, 0.15wt% TiH 2 powder, and the rest is CNTs / Al powder obtained by in-situ chemical vapor deposition. Among them, the particle size of silicon powder is 40-200 mesh, the particle size of magnesium powder is 40-200 mesh, TiH 2 The particle size of the powder is 325-400 mesh, and the particle size of the CNTs / Al powder obtained by in-situ chemical vapor deposition is 100-250 mesh.

[0039] The preparation method of the closed-cell CNTs / Al-Si composite foam material in this example includes the following steps: (1) The CNTs / Al powder obtained by in-situ chemical vapor deposition is subjected to mechanical ball milling, the ball milling speed is 300rpm, and the time is 30min. Material ratio is 5:1; (2) TiH 2 The foaming agent was pre-oxidized at 400°C for 60 minutes, and then the CNTs / Al powder obtained after ball milling in step (1) was ...

Embodiment 3

[0042] A closed-cell CNTs / Al-Si composite foam material prepared from the following raw materials: 25wt% silicon powder, 5wt% magnesium powder, 0.75wt% TiH 2 powder, and the rest is CNTs / Al powder obtained by in-situ chemical vapor deposition. Among them, the particle size of silicon powder is 40-200 mesh, the particle size of magnesium powder is 40-200 mesh, TiH 2 The particle size of the powder is 325-400 mesh, and the particle size of the CNTs / Al powder obtained by in-situ chemical vapor deposition is 100-250 mesh.

[0043] The preparation method of the closed-cell CNTs / Al-Si composite foam material in this embodiment includes the following steps: (1) The CNTs / Al powder obtained by in-situ chemical vapor deposition is subjected to mechanical ball milling, the ball milling speed is 500rpm, and the time is 120min. The material ratio is 15:1; (2) TiH 2 The foaming agent was pre-oxidized at 500°C for 120 minutes, and then the CNTs / Al powder obtained after ball milling in step...

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Abstract

The invention relates to a closed pore CNTs / Al-Si composite foamed material. The closed pore CNTs / Al-Si composite foamed material comprises, by weight, 5%-25% of silicon powder, 0-5% of magnesium powder, 0.15%-1.5% of TiH2 powder and the balance CNTs / Al powder obtained through in-situ chemical vapor deposition. The preparation method includes the steps that the in-situ CNTs / Al powder is subjectedto mechanical ball milling; the CNTs / Al powder obtained through ball grinding is mixed with the silicon powder, the magnesium powder and a foaming agent in a stirring machine; the mixed powder is subjected to cold-press molding, so that a cylindrical precast block is obtained; and the precast block is put into a cylindrical steel mold of a resistance furnace for fast foaming, and accordingly the closed pore CNTs / Al-Si composite foamed material can be obtained. According to the closed pore CNTs / Al-Si composite foamed material, foam pores are evenly distributed, and the size dimensions are uniform; and full-closed holes are formed, the strain rate sensitive effect is low, and the compression stress-strain curve has an obvious platform region. The foamed aluminum material product prepared through the method is stable in quality and excellent in performance, the preparation process is simple and the technological process is fast.

Description

technical field [0001] The invention relates to the field of foam materials, in particular to a closed-cell CNTs / Al-Si composite foam material and a preparation method thereof. Background technique [0002] Al-Si alloy is an aluminum alloy with the best fluidity. It is often used as a cast aluminum alloy. The presence of silicon particles can significantly improve the wear resistance and strength of the alloy. In the process of preparing aluminum foam, the presence of silicon can improve the strength of the material on the one hand, and increase the fluidity of the aluminum melt on the other hand, so that the gas can flow well during the foaming stage and obtain a uniform distribution of cells. composite material. In the article "Dynamic Energy Absorption Properties of Al-based and Al-6Si-based Closed-cell Aluminum Foam", Wei Haijun and others prepared a closed-cell foamed Al-Si alloy with uniform pore structure by the melt foaming method. The research shows that the foamed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C21/00
CPCB22F3/1103B22F3/1125B22F2003/1106C22C21/00
Inventor 杨旭东马有草许佳丽杨昆明赵乃勤邹田春
Owner CIVIL AVIATION UNIV OF CHINA
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